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From: "Steven W. Boese" <SBoese@uwyo.edu>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Date: Sun, 27 Feb 2011 18:18:19 -0700
Subject: RE: [FlyRotary] Re: EC2/ Tracy
Thread-Topic: [FlyRotary] Re: EC2/ Tracy
Thread-Index: AcvWxDrAOiEwylr/S+i4up/+4a8xqwAGO0Aw
Message-ID: <E1AA3B1AF41D8049B1E3FBD5E225626008872D236B@ponyexpress-mb5.uwyo.edu>
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Brian,

If mode 4 is at the default setting and the engine ran smoothly on just the=
 secondary injectors when using the backup procedure, it seems unlikely tha=
t there is a significant difference in flow rate between those secondary in=
jectors.

It might be useful to set modes 1, 4, and 6 back to factory defaults and se=
t mode 3 at a MAP just below the staging threshold.  The reason for this su=
ggestion is because when MAP becomes higher than the staging threshold, the=
re is the effect of the mixture going lean due to injector lag.  There is a=
lso the effect of the mixture going rich due to bringing on the larger flow=
 rate secondary injectors.  It just so happens that with 28 lb primaries an=
d 40 lb secondaries, these two effects very nearly cancel each other out if=
 the engine is running in the neighborhood of 4000 RPM and using about 6 ga=
l/hr.  With a default table and higher fuel flow rates than 6 gal/hr, the i=
njector lag effect will gradually tend to make the mixture richer.  The exc=
ess fuel flow rate will be about 10% by the time a flow rate of around 14 g=
al/hr is reached.  This richening tendency can then be compensated for usin=
g mode 1 or 9.  No guarantees, but it may be worth a try.

Do you happen to know at what RPM staging occurs on the ground and in fligh=
t?   Do you also know the fuel flow rates under those two conditions?

Steve Boese


From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh=
alf Of bktrub@aol.com
Sent: Sunday, February 27, 2011 2:20 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: EC2/ Tracy

No, I don't have a secondary injector failure as far as I know. Several poi=
nts- I had the injectors cleaned and flow tested. Primaries are 28 #, secon=
daries 40#- the engine
is a 13bREW- 93 twin turbo, but normally aspirated. I checked to see if all=
 the injectors were firing by disconnecting all the other leads and running=
 on mode 1, engine off and press program switch. They all are firing. Also =
ran the injector backup proceedure.

The engine runs well on the ground all through the power band, but in the a=
ir , after staging it is a bit rough and misses. My theory- the secondaries=
 are not firing equally and need to be tuned in mode 4. The engine stages n=
ormally at MAP address 84, and transistions through that point pretty smoot=
hly, and runs very smooth below that point. That's why I think I need a bit=
 of rotor matching in mode 4 above the staging point using the EGTs.

I feel that I am making definate progress.

Brian Trubee

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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3D"#000000=
" vlink=3D"#000000"><div class=3DWordSection1><p class=3DMsoNormal><span st=
yle=3D'font-family:"Arial","sans-serif";color:black'>Brian,<o:p></o:p></spa=
n></p><p class=3DMsoNormal><span style=3D'font-family:"Arial","sans-serif";=
color:black'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=
=3D'font-family:"Arial","sans-serif";color:black'>If mode 4 is at the defau=
lt setting and the engine ran smoothly on just the secondary injectors when=
 using the backup procedure, it seems unlikely that there is a significant =
difference in flow rate between those secondary injectors.<o:p></o:p></span=
></p><p class=3DMsoNormal><span style=3D'font-family:"Arial","sans-serif";c=
olor:black'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=3D=
'font-family:"Arial","sans-serif";color:black'>It might be useful to set mo=
des 1, 4, and 6 back to factory defaults and set mode 3 at a MAP just below=
 the staging threshold.&nbsp; The reason for this suggestion is because whe=
n MAP becomes higher than the staging threshold, there is the effect of the=
 mixture going lean due to injector lag. &nbsp;There is also the effect of =
the mixture going rich due to bringing on the larger flow rate secondary in=
jectors.&nbsp; It just so happens that with 28 lb primaries and 40 lb secon=
daries, these two effects very nearly cancel each other out if the engine i=
s running in the neighborhood of 4000 RPM and using about 6 gal/hr.&nbsp; W=
ith a default table and higher fuel flow rates than 6 gal/hr, the injector =
lag effect will gradually tend to make the mixture richer.&nbsp; The excess=
 fuel flow rate will be about 10% by the time a flow rate of around 14 gal/=
hr is reached.&nbsp; This richening tendency can then be compensated for us=
ing mode 1 or 9.&nbsp; No guarantees, but it may be worth a try.&nbsp; <o:p=
></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Arial","=
sans-serif";color:black'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><=
span style=3D'font-family:"Arial","sans-serif";color:black'>Do you happen t=
o know at what RPM staging occurs on the ground and in flight? &nbsp;&nbsp;=
Do you also know the fuel flow rates under those two conditions?&nbsp; <o:p=
></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Arial","=
sans-serif";color:black'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><=
span style=3D'font-family:"Arial","sans-serif";color:black'>Steve Boese&nbs=
p; &nbsp;<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-fam=
ily:"Arial","sans-serif";color:black'>&nbsp;<o:p></o:p></span></p><p class=
=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri","sans-se=
rif";color:#1F497D'><o:p>&nbsp;</o:p></span></p><div style=3D'border:none;b=
order-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNorm=
al><b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Fr=
om:</span></b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-se=
rif"'> Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] <b>On=
 Behalf Of </b>bktrub@aol.com<br><b>Sent:</b> Sunday, February 27, 2011 2:2=
0 PM<br><b>To:</b> Rotary motors in aircraft<br><b>Subject:</b> [FlyRotary]=
 Re: EC2/ Tracy<o:p></o:p></span></p></div><p class=3DMsoNormal><o:p>&nbsp;=
</o:p></p><div><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-fa=
mily:"Arial","sans-serif";color:black'>No, I don't have a secondary injecto=
r failure as far as I know. Several points- I had the injectors cleaned and=
 flow tested. Primaries are 28 #, secondaries 40#- the engine<o:p></o:p></s=
pan></p></div><div><p class=3DMsoNormal><span style=3D'font-size:10.0pt;fon=
t-family:"Arial","sans-serif";color:black'>is a 13bREW- 93 twin turbo, but =
normally aspirated. I checked to see if all the injectors were firing by di=
sconnecting all the other leads and running on mode 1, engine off and press=
 program switch. They all are firing. Also ran the injector&nbsp;backup pro=
ceedure. <o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=
=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>&nbsp;<o=
:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'font-siz=
e:10.0pt;font-family:"Arial","sans-serif";color:black'>The engine runs well=
 on the ground all through the power band, but in the air , after staging i=
t is a bit rough and misses. My theory- the secondaries are not firing equa=
lly and need to be tuned in mode 4. The engine stages normally at MAP addre=
ss 84, and transistions through that point pretty smoothly, and runs very s=
mooth below that point. That's why I think I need a bit of rotor matching i=
n mode 4 above the staging point using the EGTs.<o:p></o:p></span></p></div=
><div><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Ari=
al","sans-serif";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p cla=
ss=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","sans-se=
rif";color:black'>I feel that I am making definate progress.<o:p></o:p></sp=
an></p></div><div><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font=
-family:"Arial","sans-serif";color:black'>&nbsp;<o:p></o:p></span></p></div=
><div><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Ari=
al","sans-serif";color:black'>Brian Trubee<o:p></o:p></span></p></div><div>=
<div id=3D"AOLMsgPart_2_22f81d95-4902-4d6a-a700-9d414217c3a0"><p class=3DMs=
oNormal><span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";co=
lor:black'> <o:p></o:p></span></p></div></div></div></body></html>=

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